Agree with Greg - you might need to adjust your White Balance. Most modern digital cameras allow you to adjust WB and have a series of standard settings based on type of lighting used. In general, if the colors are too yellows, then you need to make WB cooler. If too blue, then of course WB needs to be warmer. Place a pure white card in the same lighting yo are using and take a picture. Adjust WB until the card looks exactly white )not too yellowing and not too bluish)